I saw this today in Zack Lowe's piece on DeMarcus Cousins. (A good take on Cousins by the way.)

Giving heavy minutes and a max-level salary to a big man who can't defend is a great way to lower your ceiling unless (a) that big man is a historically great offensive player, on the level of Dirk Nowitzki or peak Phoenix Amar'e Stoudemire, or (b) you can find the perfect rim-protecting complement to that player without compromising your spacing on offense. Good luck!3

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This is why Rasheed Wallace was both so valuable and so frustrating. Seven-footers who can protect the rim on defense and hit a league-average percentage from 3-point range, as Sheed did six times in an eight-year span at the peak of his career, basically do not exist. I can't tell you how many times I've heard an executive say, "You know who Team X or Team Y really needs? Someone like Rasheed Wallace." And without missing a beat, that executive/coach/scout will say, "But you know what? There really aren't any of those guys. Damn, Sheed was valuable."